APL1087R
800mA Low Dropout Fast Response Positive Adjustable Regulator and Fixed
1.8V, 2.5V and 3.3V
Features
•
•
•
•
•
•
•
•
•
•
Guaranteed Output Voltage Accuracy within 2%
Fast Transient Response
Guaranteed Dropout Voltage at Multiple Cur-
rents
Load Regulation : 0.6% Typ.
Line Regulation : 0.03% Typ.
Low Dropout Voltage : 1.3V Typ. at I
OUT
=500mA
Current Limit : 0.8A Min. at T
J
=125°C
On-Chip Thermal Limiting : 150
°C
Typ.
Adjustable Output : 1.25~7.15V
Standard 3-pin SOT-89 and TO-92 Power
Packages.
General Description
The APL1087R is a low dropout three-terminal ad-
justable regulators with 0.8A output current capability.
In order to obtain lower dropout voltage and faster
transient response, which is critical for low voltage
applications , the APL1087R has been optimized.
The device is available in an adjustable version and
fixed output voltages of 1.8V, 2.5V and 3.3V, the out-
put available voltage range is from 1.25~7.15V with
an input supply below 9V. Dropout voltage is guaran-
teed at a maximum of 1.45V at 0.5A.
Current limit is trimmed to ensure specified output
current and controlled short-circuit current. On-chip
thermal limiting provides protection against any com-
bination of overload that would create excessive junc-
tion temperatures.
The APL1087R is available in the industry standard
3-pin SOT-89 and TO-92 power packages.
Applications
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Voltage Regulator for CD-ROM Drivers
Voltage Regulator for LAN Cards
Voltage Regulator for mother Boards
Wireless Communication Systems
Portable Instrument
Portable Consumer Equipment
Low Voltage Systems
Pin Description
V
IN
A P L 10 8 7 R
1
A D J /G N D
2
V
IN
3
V
OUT
SOT-89 (Front View)
V
OUT
V
IN
AD J/G N D
TO-92 (Top View)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Apr., 2003
1
www.anpec.com.tw
7
APL1087R
Ordering and Marking Information
APL1087R -
L e a d F re e C o d e
H a n d l in g C o d e
Tem p. R ange
P ackage Code
V o lt a g e C o d e
P ackage Code
D : S O T -8 9
E : T O -9 2
Tem p. R ange
C : 0 to 7 0
°
C
H a n d l in g C o d e
TU : Tube
TR : Tape & Reel
V o lt a g e C o d e
1 8 : 1 .8 V
2 5 : 2 .5 V
3 3 : 3 .3 V
B la n k : A d ju s ta b le V e r s io n
L e a d F r e e D e v ic e
L : L e a d F r e e D e v ic e
B l a n k : O r ig in a l D e v ic e
A P L 1 0 8 7 R D /E :
A PL1087R
XXXXX
XXXXX
- D a te C o d e
A P L 1 0 8 7 R -1 8 D /E :
A PL1087R
XXXXX18
XXXXX
- D a te C o d e
A P L 1 0 8 7 R -2 5 D /E :
A PL1087R
XXXXX25
XXXXX
- D a te C o d e
A P L 1 0 8 7 R -3 3 D /E :
A PL1087R
XXXXX33
XXXXX
- D a te C o d e
Absolute Maximum Ratings
Symbol
V
I
T
J
Parameter
Input Voltage
Operating Junction Temperature Range
Control Section
Power Transistor
Storage Temperature Range
Lead Temperature (Soldering, 10 second)
Thermal Resistance from Junction to Ambient in Free Air
SOT-89
TO-92
Rating
9
0 to 125
0 to 150
-65 to +150
260
180
180
Unit
V
°C
T
STG
T
L
θ
JA
°C
°C
°C/W
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Apr., 2003
2
www.anpec.com.tw
APL1087R
Electrical Characteristics (Cont.)
Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Load line regulations are mea-
sured at a constant junction temperature by low duty cycle pulse testing.
Note 2: Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/
output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage curve.
Note 3: Minimum load current is defined as the minimum output current required to maintain regulation.
Application Circuits
1.25V to 7.15V Adjustable Regulator
Improving Ripple Rejection
A P L108 7R
V
IN
IN
ADJ
OUT
R1
12 1
Ω
+
10µ
F
C
*
1
APL1087R
V
OUT
V
IN
10µ
F
IN
+
OUT
ADJ
V
OUT
R1
150
µ
F
R2
+
C
*
3
+
R2
100µ
F
C
*
2
10µ
F
* Needed if device is far from filter capacitors
* C
3
improves ripple rejection.
X
C
should be approximately
equal to R1 at ripple frequency
V
OUT
=
1.250V
×
R1
+
R2
R1
5V Regulator with Shutdown
A P L1087R
V
IN
+
10µ
F
IN
O UT
ADJ
5V
121
Ω
1%
+
365
Ω
1%
1k
TTL
1k
100µ
F
Copyright
ANPEC Electronics Corp.
Rev. A.2 - Apr., 2003
4
www.anpec.com.tw
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